This once-derelict building is now one of the most beautiful bookstores in the world.

Not far from where one of the most famous Swedes of all time is buried, an infamous man was put to rest.

Absolutely no saxophones in the library.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

The designated Jewish quarter in Fez dates back to the 15th century.

The courtyard of this small Marinid madrasa is a dazzling example of intricate Islamic architecture.

The oldest known university in the world is in Fez, Morocco.

Crumbling necropolis set high above Fez.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

The other side is actually green.

Mosaics, storks, and brothels—this ancient city has it all.

Defy gravity at this fascinating Pyrenees overlook platform.

A beautiful modern church dedicated to the teleporting patron saint of Andorra.

Ancient catacombs form the foundation for this Rococo orgy of a church.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

The most visited, and possibly most controversial, museum in Germany.

The world's largest reflecting pool is just two centimeters deep.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

Where visitors can play more than 150 retro arcade games.

A collection of modern and vintage pinball machines housed in the cellar of a 15th-century building.

In the midst of a living monument to Soviet social engineering, Polish Catholics built this church by hand.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.